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Determining non-radiative decay rates in TADF compounds using coupled transient and steady state optical data

Sem, Stefano; Jenatsch, Sandra; Stavrou, Kleitos; Danos, Andrew; Monkman, Andrew P.; Ruhstaller, Beat

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Authors

Stefano Sem

Sandra Jenatsch

Beat Ruhstaller



Abstract

Thermally-activated delayed fluorescence (TADF) compounds are promising materials used in emissive layers of organic light-emitting diodes (OLEDs). Their main benefit is that they allow the internal quantum efficiency of the OLED to reach up to 100% by converting non-radiative triplet states into radiative singlets. Besides the importance of having a high reverse intersystem-crossing rate, which governs triplet conversion, minimizing the non-radiative decay processes is also extremely important to reach high efficiency. In this study we provide a new method to quantify not only the most important decay rates involved in the TADF process, but also the non-radiative decay rates of both singlet and triplet states individually from transient and steady state experimental optical data. In addition, the different contribution that the two non-radiative decay pathways have on the internal quantum efficiency is investigated. Finally, the method is applied to experimental data from two TADF materials.

Citation

Sem, S., Jenatsch, S., Stavrou, K., Danos, A., Monkman, A. P., & Ruhstaller, B. (2022). Determining non-radiative decay rates in TADF compounds using coupled transient and steady state optical data. Journal of Materials Chemistry C Materials for optical and electronic devices, 10(12), 4878-4885. https://doi.org/10.1039/d1tc05594a

Journal Article Type Article
Acceptance Date Jan 25, 2022
Online Publication Date Feb 14, 2022
Publication Date Mar 28, 2022
Deposit Date Mar 15, 2022
Publicly Available Date Mar 29, 2024
Journal Journal of Materials Chemistry C Materials for optical and electronic devices
Print ISSN 2050-7526
Electronic ISSN 2050-7534
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 10
Issue 12
Pages 4878-4885
DOI https://doi.org/10.1039/d1tc05594a

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